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std::extents<IndexType,Extents...>::static_extent

static constexpr std::size_t static_extent( rank_type i ) noexcept;
 (since C++23)

Returns static extent size of an extents at the rank index i. If the rank index i is a dynamic extent, returns std::dynamic_extent.

Parameters

i - The rank index to get the static extent size of

Return value

The static extent size or std::dynamic_extent value.

Example

#include <iostream>
#include <mdspan>
 
int main()
{
    std::extents<int, 1, 2> e1;
    std::extents<int, 3, std::dynamic_extent, std::dynamic_extent> e2(4, 5);
    std::cout << e1.static_extent(0) << ", " << e1.static_extent(1) << '\n';
    std::cout << (e2.static_extent(0) == std::dynamic_extent) << ", "
              << (e2.static_extent(1) == std::dynamic_extent) << ", "
              << (e2.static_extent(2) == std::dynamic_extent) << '\n';
}

Output:

1, 2
0, 1, 1

See also

returns dynamic extent size of an extents at a certain rank index
(public member function)
(C++11)
 obtains the size of an array type along a specified dimension
(class template)

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